为评估主动调频策略下机组载荷响应,获得较优的控制参数和机组载荷约束下的边界调频次数,文章采用单因素对比仿真研究的方法对电网支撑功率、支撑时间和恢复策略下的控制参数进行了仿真试验.试验研究了调频策略对风电机组各部件载荷的敏感度,试验结果表明:传动链扭矩Mx的敏感度最高;迭代获得了风电机组每日支撑电网的边界调频支撑次数为115～350次,为风电场电网调度提供了参考;基于部件敏感度和机组部件机械约束确定了主动调频控制策略较合理的参数范围,为风电场主动调频策略优化提供了仿真依据.

针对风电机组变桨轴承漏脂问题,从密封圈密封性能、变桨轴承内部结构设计、润滑脂的选择及填充用量等方面进行分析,通过选择抗老化和抗磨损性能好的密封圈材料,把密封圈的双唇结构改为多唇结构,沟底增加矩形沟槽,改善轴承脂孔尺寸与分布,增加轴承排脂孔外侧连接螺纹孔的直径和深度,改善润滑系统控制策略,设计变桨轴承运行时注脂的频率、时间等指标,增加废脂清除系统等措施,基本上可以杜绝变桨轴承漏脂现象.

基于某2 MW风力发电机组发电、待机、风轮锁定等不同状态,仿真模拟偏航角度偏差对机组载荷的影响,获得了极端载荷下的偏航偏差角.基于叶片气动性能曲线对偏航过程中机组载荷变化的趋势进行理论研究,确定了不同风速下偏航限值的参考值,与仿真分析相结合制定了风力机组的偏航保护策略,可有效降低机组的极限和疲劳载荷.

大型变速变桨风力发电机组在变桨距控制过程中,由于额定风速附近推力呈尖峰变化趋势,导致机组的极限载荷较大,针对该问题提出一种修正变桨动作的削峰调节控制器.将该功能编程写入外部控制器,通过Bladed软件设置不同的工况,对某3 MW风电机组进行仿真验证,仿真结果表明该控制器能够改善变桨控制的动态特性,降低关键部件的载荷,提高机组的可靠性和安全性.

以某2 MW风电机组为研究对象,利用模型线性化方法,基于Bladed和ANSYS平台对不同塔架结构参数和地基刚度下塔架固有频率及振型开展研究,通过对不同微观气象条件下不同固有频率塔架进行时域和频域载荷响应分析,获得了微观气象条件对塔架载荷响应的扰动规律.实际风场可根据风资源情况对塔架进行控制加阻以降低环境载荷对塔架的不利影响,具有一定的现实意义.

针对MW级风力发电机组轮毂强度安全问题,使用有限元分析软件ANSYS和疲劳分析软件FE-safe,在考虑变桨轴承非线性影响情况下,采用风轮总体模型与轮毂子模型相结合以及临界平面法与最大主应力算法相结合的计算方法,对某大型风力发电机组轮毂的极限强度与疲劳强度进行了评估;为使叶片变桨时准确停留在顺桨位置,在轮毂装配系统中设计了变桨缓冲装置,并对装置组成件变桨挡块和挡块凸台在顺桨工况下的极限强度进行了分析.研究结果表明:轮毂的极限和疲劳强度以及变桨挡块和挡块凸台的极限强度均能满足设计要求,为风电机组轮毂和变桨缓冲装置的设计提供了参考依据.

In order to select variable pitch motor in a simple and rational way,the formula to calculate the torque of a generator in different operating modes was deduced on the basis of analyzing the stress transmission of variable pitch motor and pitch bearing.Then,the load was calculated through the simulation model in the Bladed software.Based on the analysis of the load calculation data,the maximum drive torque,the nominal torque,and the maximum brake torque of the variable pitch motor were obtained,which could provide references for the variable pitch motor selection.

Aiming at the problem that the wind turbine's loads would be increased when the cut out wind speed was increased to improve the energy production,the theoretical calculation based on blade element momentum and inertia law about components loads of the turbine were conducted,a method of power limited above cut out wind speed was proposed,the power limited simulation test research on a 2 MW wind turbine of a company based on BLADED software was performed,using the NWP and NTM wind model as the simulation external condition.The results indicate that this method can improve the theoretical annual energy production about 0.76％,and the fatigue loads increase with the increasing output power,while the ultimate loads show the different changing trends,which consistent with the theoretical calculation.The results can provide some reference for the envelope loads calculation and cut out wind speed setting.

With the development of wind power industry,the power class of wind turbine is basically MW in the mar-ket,and the rating power has showed growth trend.It introduced the 3-point support main bearing design and 2-point sup-port main bearing design in MW wind turbine.For 2-point support main bearing design,it had 7 kinds of structure and in-troduced them.The advantages and disadvantages were analyzed.It can be used to provide some references in main bearing design and selection of MW wind turbine.